Summary: Insect-associated nematodes coordinate their development using host cues to ‘walk the line’ between mutualism and pathogenesis. A host pheromone causes terminal embryogenesis by permeabilizing the nematode eggshell.

Summary: Olfactory sensitivity to conspecific urine and intestinal fluid depends on the sex and maturity of both the donor and receiver in the Senegalese sole, a marine flatfish, which is indicative of pheromonal communication.